Masutaka Inoue

54.3: SXGA Non-Glasses 3-D Displays with New Image Splitter Head Tracking System

16″ and 18″ SXGA non-glasses 3-D displays are newly developed. Those displays are equipped with new head tracking system, consisting of electrically movable LC image splitter and CCD camera, which enlarges stereoscopic viewing area. Those displays are compatible with 2-D images by eliminating the effect of image splitter electrically.

High‐efficiency optical system for ultra‐short‐throw‐distance projector based on multi‐laser light source

— A novel laser-light-source projector having the three outstanding features of high brightness, ultra-short throw distance, and high color reproduction has been developed.These features have recently come to be required in the high-end projector market. The technologies for the laser-light-source projectors fully utilize the advantages of lasers, such as high luminance, small etendue, and high color purity. By integrating a triple-rod illumination system with a multi-laser light source and an ultra-wide-angle projection system, the developed high-efficiency optical system has achieved a brightness of 7000 lm and a throw ratio of 0.28 with an image size of 100–150 in. Another new technology, laser color processing (LCP), has offered vivid color reproduction which has a color gamut that is up to 180% wider than the BT.709 standard without appearing unnaturally colored. Furthermore, a speckle suppression effect produced by the multi-laser light source has been demonstrated. In this paper, an overview of these newly developed technologies that are used in the novel laser-light-source projector is presented, and solutions to the issues of speckle noise and safety are presented.

8.2: Color Tuning Projection System for Adaptive Combination of High Brightness and Wide Color Gamut

We have developed a new projector with a fourth liquid crystal panel that controls yellow light separately from RGB lights of UHP lamp. This additional panel system enables projector to achieve adaptive control of both high brightness and 120% wide color gamut. In this paper, we propose the innovative design concept and the technical development of the Color Tuning Projection System and represent the characteristics of the prototype.

Development of a color 3D display visible to plural viewers at the same time without special glasses by using a ray-regenerating method

We have newly developed a few kinds of new auto-stereoscopic 3D displays adopting a ray-regenerating method. The method is invented basically at Osaka University in 1997. We adopted this method with LCD. The display has a very simple construction. It consists of LC panel with a very large number of pixels and many small light sources positioned behind the LC panel. We have examined the following new technologies: 1) Optimum design of the optical system. 2) Suitable construction in order to realize very large number of pixels. 3) Highly bright back-light system with optical fiber array to compensate the low lighting efficiency. The 3D displays having wide viewing area and being visible for plural viewers were realized. But the cross-talk images appeared more than we expected. By changing the construction of this system to reduce the diffusing factors of generated rays, the cross-talk images are reduced dramatically. Within the limitation of the pixel numbers of LCD, it is desirable to increase the pinhole numbers to realize the realistic 3D image. This research formed a link in the chain of the national project by NEDO (New Energy and Industrial Technology Development Organization) in Japan.

65.3: Distinguished Paper: High Efficiency Optical System for Ultra-Short Throw Distance Projector Based on Multi-laser Light Source

We have developed a high-efficiency optical system that uses multiple lasers as a light source. This optical system enables us to produce a novel laser projector with a high brightness and an ultra-short throw distance. By utilizing the advantages of a laser, we have achieved a brightness of 7,000 lm and a throw ratio of 0.28 with an image size of 100–150 inches.

Color‐tuning projection system for adaptive combination of high brightness and wide color gamut

— The demand for projectors with high brightness and wide color gamut has been increasing; however, UHP lamp projectors cannot deliver those two qualities efficiently and simultaneously because of its color-separation system. The newly developed projection system — “Color-Tuning Projection System” — realizes the adaptive combination of high brightness and wide color gamut with one projector. This projector features a fourth liquid-crystal panel — “Color Tuner” — with a 3LCD optical engine, which controls yellow light separately from the RGB light of a UHP lamp. This color-tuner-based optical engine — “Color-Tuning Optical Engine” — and a new color-conversion signal-processing algorithm — “Adaptive Color Conversion Algorithm” — controls the yellow-light volume and corrects color-shifted pixels according to the brightness and chromaticity analysis of the input image, key technologies of the Color-Tuning Projection System. This additional panel system enables the projector to ach ieve up to 115% higher brightness and 120% wider color gamut according to the input image. This paper presents an innovative design concept, a novel technology regarding brightness and a color-gamut conversion projection system, and the characteristics of the prototype.

Adaptive color conversion algorithm to achieve both high brightness and wide color gamut

We present a new color conversion algorithm for the new projector with the forth liquid crystal panel which controls the yellow light separately from RGB lights of the three-LCD system. This algorithm controls the volume of yellow light and corrects distorted color based on image analysis, and thus achieves high brightness and wide color gamut.